waite



H T I A W E H (No Model.)

' TELEPHONE RECEIVER.

ism? WITNESSES UNITED STATES PATENT: OFFICE.

HENRY E. WAITE, OF NEW YORK, N. Y., ASSIGNOR TO THE MoLEcpLAR TELEPHONECOMPANY, OF SAME PLACE.

TELEPHONE-RECEIVER.

SPECIFICATION forming part of Letters Patent --No 287,742, dated October30, 1883,

' Application filed Angust3',1883. (No model.)

To all whom it may concern making part of this specification.

This invention relates to the reproduction of sounds or combinations ofsounds through the agency of undulatory currents of electri city,whereby articulate speech can be transmitted over atelegraph-line.

One form of my instrument is made in the following manner: On one end ofa straightbar permanent magnet is placeda helix, the covered wire woundthereon being in the mainline current. This magnet is secured in a tubeof wood, ebonite, or other non-conducting material, this tube being atone end enlarged into a cup inclosing the helix. Upon the rim of thiscup is secured, by means of the usual ear-piece, a tympan of wood,ebonite, card-board, glass, brass, cork, or of any equivalent materialnot subject to the action of mag netism.- A thin or thick bar of steelor iron, or of other material capableof being acted on by magnetism, issecured at one end to the inside of the cup, forming an arch over thecore of the helix, close tothe end of the magnet, within the magneticfield; or it may be held loosely by means of a screw through a slot ineach end of the bar, so that the bar, when attracted by the magnet, mayglide easily. A short spur projects from the strip of iron directly overthe center of the core of the helix, against which spur the tympan isheld by the ear-piece.

In the accompanying'drawing, which represents the preferred form orconstruction, A represents the inclosing tube or handle; A, the enlargedchambered end or cap inclosing the coil, and to which the tympan andearpiece are secured in any usual or preferred manner; I), thebar-magnet; c, the coil placed on the end of the magnet, within thechambered end; d, the tympan, and c the arching bar,of steel or itsequivalent magnetic material, referred to, provided with the spur e,

resting in contact with the tympan d, as exu V has its other endsupported upon the ledge on the opposite side, but not fastened thereto,thus leaving it free to slide on the ledge, to accommodate any vibrationin the bar 6, due to disturbances in degree of polarity in the magnet,said bar being arranged in inductive proximity to said magnet, and inthe form of a spring arching over its end, as shown. I

I do not confine myself tothe use of permanent magnets. Electromagnetsmay also be used.

By this construction of an instrument for reproducing articulate speech,the disagreeable metallic nasal sound always resulting from the use of adisk of iron in a telephone, as also K the frequent buzzing, areavoided, the articu any convenient manner upon a short spur placed onthe middle of the iron bar, immediately over the center of the magnet,substantially as described.

In testimony whereof Ihave hereunto set my hand this 2d day of August,A. D. 188.3;

HENRY E. WAIT-E;

